Update AzCopy

[RobertoPrevato]

The current image is installing AzCopy from this url:

wget -O azcopy.tar.gz https://aka.ms/downloadazcopylinux64

This URL serves the version 7.3 of the software, which doesn't implement methods to handle Azure Storage Account.

Update to use:

wget -O azcopy.tar.gz https://aka.ms/downloadazcopy-v10-linux

Note: the new version doesn't require installation. See more information here.

[RobertoPrevato]

Temporary solution to use the new version on the fly (in line with official "Use Node.js" tasks):
(not tested):

if [ ! -d "/_work/_tool/azcopy" ]; then
 cd /_work/_tool
 mkdir azcopy
 cd azcopy
 wget -O azcopy.tar.gz https://aka.ms/downloadazcopy-v10-linux
 tar -xf azcopy.tar.gz
 cd azcopy_linux_amd64*
 mv azcopy ../
 echo 'export PATH="/_work/_tool/azcopy:$PATH"' >> ~/.bash_profile
 echo 'export PATH="/_work/_tool/azcopy:$PATH"' >> ~/.bashrc
 source ~/.bashrc
 cd ~
fi